Discussion
A constraint solver takes seconds on most instances of a problem but occasionally runs for hours.
What is the most appropriate response?
Answer: C
That pattern is the signature of a heavy tail caused by unlucky early branching, and restarting with different random choices while keeping the learned no-goods truncates it directly. Stronger propagation helps generally but does not address the tail, model size is fixed by the problem, and local search would lose the ability to prove unsatisfiability. Matching the remedy to the shape of the runtime distribution, rather than to its average, is the diagnostic skill here.
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